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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b0f56ea9c068a4c1da57fd5ddcdfb572f1f0b02a6bdf03d84da669a0fa0df6' 
  AND token = 'a8oALCBBnYgR8OXmj8JP+72Q7Qyqg0it/nSgfLyd1fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}